Smoke-consuming furnace.



v 0. D. ORVIS.

SMOKE consumme FURNACE. APPLICATION FILED JAN. 20, 1910. BEENEWBD OUT. 21, 1913. 1,097,662, Patented May 26, 1914.

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SMOKE GONSUMING FURNACE. APPLmETIoN FILED JAN. 20, 1910. RENEWED OUT.

21, 1913- 1,()9'7,662, Patented 26,19M

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SMUKE GONSUMING FURNACE. APPLICATION FILED JAILBO, 1910. RENEWED 001221, 1913.

1,097,662, Patented M 26, 1914.

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APPLICATION TILED 11111.20, 1910, nmmwnn 001'; 21, 1913.

1,097,662. Patented May 26, 191

4 BHEBTHIEET 4;

URLAND D. OBVIS, OF NEW YORK, N. Y.

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' Specification of Letters Patent.

Application filed January 20, 1910, Serial No. 538,997. Renewed October 21, 1913. Serial No. 796,515.

To all whom it may concern Be it known that l, 'ORLAND D. Davis, a citizen of the United States, residing in the city of New York, borough of Manhattan, county and State of New York, have in,- vented a certain new and useful Smoke- Consuming Furnace, of which the following is a specification.

This invention is a smoke consuming furnace wherein air and steam are injected into the escaping smoke and gases in such manner as to increase the draft throughout the area of the grate and to promote thecombustion of the gases, to the end that the carbon in the smoke is consumed for the purpose of increasing the steaming capacity of the boiler and of attaining marked economy in the quantity of coal consumed.

The parts composing my invention are capable of installation easily and quickly in ordinary furnaces associated with boilers of the return tubular type. Said parts are simple in construction, economical to manufacture, and are so protected that they will not burn out readily, thus rendering the furnace bot-h durable and economical..

The essentially novel features of my invention consist of a blast box or flue co1nposed of matching sect-ions or saddles which are seated upon a supporting member, the latter being, preferably, composed of a water tube positioned horizontally within the grate chamber, said tube extending transversely to the length of the grate chamber. The supporting member (or water tube) is held in the side walls of the grate chamber, the blast box is supported thereon, and said blast box in turn supports the brick work or tiles forming an arch which engages the lower side of the boiler.

An important structural part of my furnace is a bridge wall with a concave or inclined breast, over which bridge wall is positioned the water tube, the blast box, and the brick work composing the arch in such manner that the vertical front face of said parts is in the vertical plane of the front surface of the bridge wall. The blast box is provided with rearwardly facing outlets adapted to discharge a blast rearwardly through the throat intervening the bridge wall and the boiler, and said parts are so related to the bridge wall that a partial vacuum is produced, by the blasts, in the space intervening the curved breast of said bridge wall and the water tube, whereby the draft is rendered uniform through the grate and substantially throughout the area thereof, to the end that all the fuel in the incandescent bed of fuel on the grate-Will be consumed.

In a practical embodimentpf the invention. the blast box is composed of matching sections, whereby the operative length of the box may be varied to adapt the same to furnaces of different widths, each section having a rearwardly facing exit for directing a jet or stream of air and steam overthe bridge wall. one end of the blast box, and a steam jet c0- operates with the air inlet so as to induce a plentiful supply of air to said box.

In a preferred construction, the blast box is constructed-to the end that air and steam will circulate and return through the same before the blast is discharged, whereby the steam and air are heated prior to their dis charge into the gaseous products of combustion escaping over the bridge wall.

In, the accompanying drawings I have illustrated different practical embodiments of the invention, but the constructions shown therein are to be understood as illustrative, only, and not as defining the limits of the invention.

Figure l is a vertical longitudinal section,

partly'in elevation, illustrating my furnace in connection with a return tubular boiler.

An air inlet is provided at.

latented m 26, 1914.

Fig. 2 is a vertical cross sect-ion on the line v 2-2 of Fig. 1. l ig. 3 is a horizontal sec tion. partly-in plan, the plane of the section being indicated by the dotted line 3-3 of Fig. 2. Fig. 4 is a, vertical cross section on an enlarged scale illustrating the relation of the arch to the bridge wall. Fig. 5 is a detail perspective view of one of the sections composing the blast box. Fig. 6 is a plan view illustrating an end section of the blast box and blast pipe connected with said end section. Figs. 7 8 and 9 are detail cross sections through other embodiments of the invention.

' The boiler furnace shown in Figs. 1 to 6, inclusive, embodies a grate, A, within a grate chamber, A, a bridge Wall, E, and a fine, C extending over the bridge wall and adapted for the passage-of products of combustion from grate chamber, A, into the tlues of boiler, D, the latter being of the return tubulartype. As is usual in the art, fuelis supplied to the grate through a. door opening, a, and air enters ash pit, a through the usual ash pit door opening, a These parts, together with other parts of the furnace, may beiof the usual, or any preferred construction, a'ndl donot consider it necessary to describe said parts in detail.

Bridge wall, B, is provided with a top surface which extends downwardly and forwardly toward the grate chamber, and as shown in Figs. 1 and 4, this top surface is concave, asat b.

One of the important parts of my invention is a supporting member, E, extending across the furnace and positioned in the vertical. plane of the curved surface, I), of the bridge wall. This supporting member is shown as a pipe or tube, the end portions of which are supported in side walls, b, 6 of the furnace, see Fig. 2. It is preferred to employ a water circulating tube as the tubular supporting member, E, and to one end of this tube is connecteda coupling, 0, shown in dotted lines in Fig. 2.; The coupling is embedded in the side wall, 79 and it is provided with an extension, 6', which is closed preferably, by areducing coupling and plug, 6 see Fig. 2., To the coupling is connected one end of a circulating pipe, f shown in dotted lines in Figs. 1, 2 and 3. The circulating. pipe extends diagonally across the furnace in the rear of the bridge wall, and to the rear part of this pipe is connected an upstanding branch pipe, the upper part of which is attached to the rear of boiler, D, and at a suitable point below the water line therein. Theend of pipe, E, opposite to coupling, e, is provided with an elbow, 9, shown in dotted lines in Fig. 2, said elbow being embedded in side wall, 6. To this elbow is attached one end of an inclined circulating pipe, 9, extending lengthwise of wall, Z), and forwardly from the bridge wall. This pipe, g, is connected to another pipe 9 the upper part of which is attached to the front end of boiler, D, at a suitable point below the water line.

From this description it is apparent that water may circulate from the rear part of boiler," 1D, through pipes, f, f, thence through; the tubular supporting pipe, E, from whence the water passes from pipes, g, 9 back into the boilerat the front part thereof, whereby the water is heated in its passage through the pipes, and the circulation of the water precludes excessive heat-- ing of tube or pipe, E, which is positioned directly in the path of the products of combustion escaping from the grate chamber. It is preferred to arrange thetransverse tubular supporting member, E, in a slightly inclined position, as shown in Fig. 2, for the purpose of facilitating the circulation of Water through the pipe, and by removing cap, 6 the interior of the pipe may be inspected and cleaned without disturbing the connections of said pipe with the boiler.

Tubular supporting member, E, carries reference character, F. This blast box is imposed directly upon the tube or pipe, E, so as to be supported or carried thereby, and upon this blast box is built'the brick work, G, which extends upwardly to, and partially surrounds, the under surface of boiler, D. It is preferred to construct the blast box in sections which are adapted to match or register so as to produce a continuous cham her for the infiowing air and steam. One section of the blast box is shown in Fig. 5, by reference to which it will be seen that the section consists of side walls, f, f, a top wall, 7?, and a bottom, f, the under surso as to produce a saddle which conforms to or tube, E. The several walls of the blast box section produce a chamber which is open at the ends of the section. A number of these sections are employed, as shown in Figs. 2 and 3, and they are placed upon or fitted to tube or pipe, E, so as to have abutting engagement at their open ends, whereby the chambers of the sections register or match to produce a cont'nuous longitudinal chamber within the blast box. The sections are seated firmly upon tube, E, by reason of the curvature given to their faces, as at f, said sections protect the upper surface of the tube from direct contact with the heat and products of combustion. The saddles formed by the under surface of the sections envelop or inclose the upper side of the tube, and said sections are precluded from displacement upon the tube by the super posed brick work, G, the upper part of the latter engaging with the under surface of the boiler. The sections may be easily and quickly placed in position upon the tube, and when-the furnace is in operation the metallic sections expand so as to engage with each other and practically close the joints between the sections soas to preclude the escape of steam and air.

In one practical embodiment of the invention the sections of the blast box are provided with recesses, h, h, on the front and the rear walls, f, f, respectively, and in these recesses are fitted bricks, H, or other fire resisting material may be placed in the recesses so as to protect the metallic sections from excessive heating. It is pieferred to employ fire bricks extending in rows across 'the joints between the sections of the blast box, and said bricks thus practically close the joints between the blast box sections, thus further precluding the escape of steam and air into the grate chamber.

In a preferred embodiment of the invention, the chamber of the blast box is divided division of the blast box chamber is secured a blast box designated in its entirety by the face of the bottom being curved, as at f,

the external cross sectional contour of pipeso as to produce two compartments. This- "byeihploying a partition, 2'', within ea 11 section of said blast box. The partitions, 2', of

theseveral sections are adapted to register when the sections are assembled in operative positions upon tube, E, and the partitions of the several sections thus produce a longitudinal partition within the blast box, whereby the interior of said blast box is divided into compartments, 1, l. A section, F, at

one end of the blast box is shown in Fig. 6,

by reference to which it will be seen that 'onee'nd of the section is closed by a head,

rear wall, f, of each section composing the all) blast box is provided with an exit, is, which may be in the form of a slot cast in said rear wall, This exit communicates with the compartment, 1, of the blast box, and as each section is provided with a blast exit, it is apparent that the blast box is provided in its rear wall with a series of exits. The endof the'blast' box oppositeto the end section shown in Fig. 6 is provided with a return bend, K, embedded in side wall, 5, as shown in Fig. 3/ The end portions of this bend are attached'to the end section, F of the blast box so as tocommunicate with the compartments, l, l, and the steam and air admitted into compartment, I, is adapted to circulate lengthwise of the blast box and to pass through the bend, K, from compartment, ll, into compartment, 1, from whence the heated blast is distributed through the.

exits, k, in the rear wall of the blast box.

Pipe, J, extends through sidewall, 5 and is turned upwardly, as shown in said Fig. 2. into this pipe, J extends a steam jet, J having a pipe, j, attached thereto, said pipe extendingupwardly to steam dome, cl, and

said pipe being provided with one or more valves, j for the purpose of cutting off and regulating the flow of steam from the boiler into the jet- Steam may thus be admitted, at boiler pressure, into the elbow of pipe, J, and the infiowing jet of steam induces a flow of air through said pipe, J, whereby steam and air are admitted into compartment, I,

of the blast box.

In my furnace, the tubular supporting member, E, is positioned directly mm the curved surface, I), of the bridge wall, it being preferred to arrange said tubular memher in a vertical plane intermediate the vertical front and rear faces of said bridge wall. As shown in Fig. 4:, the front edge of tubular member, E, is in the vertical plane of the front face of the bridge wall, but, obviously, this member may be positioned a little to the rear of the front face. he unnuances ing a throat or passage, B, between the curved surface of the bridge wall and the external surface of pipe or tube, E, which throat,-l3, establishes communication be tween grate chamber, A, and the rearwardly extending flue, C. The blast box. F, and brick Work, G, rest directly upon the supporting member so as to substantially partake of the relation of said supportingrmemher to the,bridge wall. The blast exits in the rear surface of the blast box are in a horizontal .plane above the top edge, 5", of the bridge wall, and thus the blast of steam and air is discharged, into the throat above the bridge wall so as to create a partial vacuum in throat, B, whereby the draft is in creased through the grate chamber and substantially throughout the area of the grate.

Tn installing the arch within the furnace, the bridge wall is built in the usual way, but its construction is modified so as to produce the curved surface, b,-directly in the rear and above the horizontal plane of the grate. Pipe, E, is arranged across the furnace so as to lie over the curved surface of the bridge wall, and the proper connections are made from the end portions of this pipe with the respective ends of the boiler. The sections composing the blast box are easily and quickly placed in position, pipe, J, is connected to end section, F, and elbow, K, is connected to the other end section, F after which the steampipe and the jet are connected in the described manner so as to supply steam from the boiler dome to the blast box.

The furnace is fired in the usual way, and

, I, of the blast box, and from this compart- .1nent the blast flows through exits. it.

The blasts-are delivered into the top of throat, B, so as to create a partial vacuum which induces an increased draft through the grate chamber. The products of combustion have a tendency to flow upwardly from the grate through chamber, A, and into contact with the under surface of boiler, D, but when they strike the arch formed by tube, E, blast box, F, and brick work, G, the products of combustion are forced to flow downwardly and beneath tube, E. As" the gases pass into the throat, B, they strike the curved surface, b, of the bridge Wall which deflects the gases upwardly and forwardly toward the arch, and the gases thus pass through throat, B, into flue, C. The

- 7, 8 and 9 of the drawings, but in'each' instance I employ the water circulating tube, E, as a means for supporting the sections of the blast box. In Fig.- 7, the blast box is shown as consisting of a series of sections each having a chamber which is not divided,

as for example, by the partition, z', in the construction shown in Figs. 1 to 6, inclusive. Each section of the blast box is provided with a curved under surface, f, to form a saddle which rests snugly u on the upper side of'tube or pipe, E. e sections of the blast box consist of the front,

rear, bottom and top walls, substantially as shown in Fig. 5, and in the front and rear walls are the recesses adapted to receive the bricks, H, substantially as shown in Fig. 4. The rear wall of each blast box section is provided with the exit, is, which .00

municates directly with thechamber, F of the blast box. The sections composing the blast box .are placed upon pipe, E, in a manner heretofore described, and. bricks,

H, G, are placed upon said blast box sec-v tions so as to complete the arch which extends upwardly to the boiler, as heretofore described.

It is not necessary to provide the fire brick, H, at the front and rear of the blast box, and in Fig. 8 I have shown a blast box composed of sections, F*, the walls of which are considerably thicker than the walls composing the blast box sections of Figs. 1 to 5, and 7, respectively. In the construction of Fig. 8, each section of the blast box is composed of a single casting having a curved under face and a single F is provided with a flat top surface upon chamber, the rear wall of each section being provided with blast exit, is, which communicates directly with the blast chamber. Sections, F", are adapted to be easily and quickly placed upon the tubular supporting member, E, and said sections, F, receive the bricks, G, which complete the arch.

In the construction of Fig. 9, the blast box is built up and is a compo-site structure, composed of metal and fire brick. The metallic parts are saddles, Ft", each cast in a single piece and havinga curved under surface, as at f, to partially embrace the tubular supporting member, E. Each saddle,

which rests a blast pipe, L.- This blast pipe is positioned within a chamber, Z, which 18 formed byfire brick,- H, H, installed at the frontand rear edges of saddles, F said fire brick or slabs being imposed directly upon and carriedby the saddles. The brick work, G, is builtupontheffire. brickso as to complete the arch which-engages with the boiler. It will be seen that chamber, Z, is formed by metallic saddles, F", and by fire brick, H, H and Gr. The blast ipe extends horizontally within said cham r, 1, so

as to be protected from excessive heat by the saddles and the brick work. As shown, the rear" the brick, H is providedwith blast nozzles, L, and these nozzles-are 'connected by nipples, c, with blast pipe, L,

whereby the nozzles are coupled to the blast pipe for communication directly therewith. Obviously, the nozzles open rearward-1y through fire brick, H andthe blast supplied by pipe, L, is distributed through nozzles, L.

The structures shown in Figs. 7, 8 and 9 are positioned across the furnace and over bridge wall, B, in the manner heretofore described, and illustrated in Figs. 1 to 4, inelusive, of the drawings.

The operation and advantages of the invention will be readily understood from the foregoing description taken in connection with the drawings...

Having thus-fully described the invention, what I claim as new, and desire to secure by Letters Patent is:

1. In. a'.boiler--- furnace, the combination with a combustion chamber and av bridgewall, of a tubular supporting and water circulating member positienedover a part of the bridge wall and spaced relatively thereto, the under surface of said tubular member being normally exposed to the heat from the combustion chamber, an air-blast box embodying unitary members which are, seated individually upon said tubular member so as to leave the surface thereof exposed to the heat, said unitary members being connected end to end for the circulation of air lengthwise of the air-blast box and said box being provided in the rear wall thereof with blastv outlets whereby jets of air are projected into the products of combustion flowing over the bridge wall, and a wall of refractory material extending upwardly from said box and partially incasing it.

2. In a boiler furnace, the combination with a combustion} chamber and a bridge wall, of a tubular supporting and water circulating member positioned above and in members' being' engaged individually with the top of the tubular member so as to leave,

exposed the under surface of said member and said air-blast box-being provided in the rear thereof, and above the tubular member, with blast outlets, means for injecting steam into one end'ofithebla'st box to induce the inflow'of air thereto, and a'wall of refractory material extending upwardly from said blastbox. 3. In a boiler furnace, the combination with'a combustion chamber, and a bridge wall, of a tubular supporting and water circulating member'positioned in spaced relationto the bridge wall, an air blast box-embodying chambered members each provided with a concave under surface for engagement with thetop, front and rear of said tubular. member whereby the under surface of said tubular member is exposed to the heat flowing over the bridge wall, and a wall of refractory material extending upwardly from, and substantially incasing, the blast box, said blast box having air outlets posi-- tioned in the rear'wall thereof for discharging air directly into the products of combustion flowing upwardly and over the bridge wall.

4. In a boiler furnace. the combination with a combustion chamber and a bridge wall, of a tubular supporting and water circulating member spaced relative to the bridge wall, an air-blast box seated upon said tubular member and partially incasing it so as to leave the under surface of said member exposed to the action of heat, a wall of refractory material extending upwardly from said blastbox and partially incasing the latter. means for supplying steam to said blast box. and means for discharging steam and air rearivardly from said blast box, said tubular mefinber, blast box and refractory wall cooperating in the production of a heat baffle adapted to deflect the escaping products of combustion in downward and upward paths whereby the water and air flowing through the tubular member and the blast box, respectively, will be heated by the escaping products of combustion. 4

5. In a boiler furnace. the combination with a combustion chamber and a bridge wall, of a tubular water circulating member extending across said chamber and spaced with respect to the bridge wall, a metallic blast box separate from said tubular member and seated thereon so as to be supported thereby. said blast boxpartially incasing the tubular member and leaving the under surface thereof exposed to the heat, means for supplying steam to said blast box and inducing the flow of air into the same, means for discharging steam and air rearwardly from the blast box and a refractory wall supported by the blast box vthe blast box and coiiperating with the tubular member in the production. of a battle below which the products of combustion are adapted to flow in a manner to heat the water and the airadapted toflow through the tubular memberand the blast box, respectively.

6. In a boilerifurnace, the combination with a combustion chamber, of a bridge wall provided with an upwardly curved front surface, a tubular supporting and water circulating member positioned over the front part of, and in spaced relation to, said curved surface of the bridge wall, a metal blast box separate from the tubular member and, seated upon the same so as to partially inease it and expose the under surface thereof, means fon'supplying steam to the blast box for inducing the inflow of air, meansfor discharging steam and air rearwardly from the blast box, and a wall of refractory material sup ported by the tubular member and incasing the metal blast box, said wall cooperating with the blast box and the tubular member to form a baffle below which the products of combustion are adapted to flow for heating water and air adapted to flow through the tubular member and the blast box, respectively.

7. In a boiler furnace, the combination with a combustion chamber and a bridge wall, of a tubular supporting and water circulating member positioned across the cham ber and in spaced relation to the bridge wall, a metal blast box separate from the tubular member and supported thereby, said blast box embodying a series of unitary sections seated upon and partially incasing the tubular member, so as to leave the under surface of the latter exposed, a wall composed of refractory material supported upon the tubular member and substantially incasing the metal blast box, means for injecting steam into the blast box, and blast outlets in the rear wall of the blast box for supplying steam and air to the products of combustion flowing beneath the tubular member in a manner to heat the water and the air flowingthrough the tubular member and the metal blast box, respectively.

8. In a boiler furnace. the combination with a combustion chamber and a bridge wall, of a tfl bular supporting and water circulatingmember positioned across the chamber and in spaced relation to the bridge wall, a metal blast box separate from the tubular member and embodying a plurality of unitary chambered sections each provided with an internal partition and said sections assembled end to end to bring the chambers and partitions into register. said blast box sections being seated individually upon the tubular member and partially incasing t, so as to expose the under surface of said member, a wall of refractory material supported on the tubular member and the blast box to partially incase the latter and to produce a bafile below which the products of combustion are adapted to flow for heating the water and air adapted to flow through the tubular member and the blast box, respectively, means for supplying steam to the blast box and inducing the inflow of air, and blast outlets in the rear wall of the blast box for supplying steam and air to the products of combustion flowing over the bridge 'wall.

' 9.111 a boiler furnace, the combination of a combustion chamber, and a bridge wall, of a tubular supporting and water circulating member positioned in spaced relation to "thebridge wall, a metal air-blast box separate" from the tubular member, said blast,

box bein provided with a concave under surface an with brick-supporting ledges substantially above said concave under surface, said blast box being seated upon the tubular member. to partially incase it and expose the under surface thereof, a wall of fire brick erected upon the blast box and the ledges thereof for partially ,incasing said blast box,

means for injecting steam into the blast box to induce the inflow of air, and blast outlets in the rear wall of the blast box.

7 10. In a boiler furnace, the combination with a combustion chamberand a bridge wall, of a tubular supporting and water circulating member-positioned in spaced relation to said bridge wall, a plurality of metal members having concave under surfaces, said members being positioned upon said tubular member so as to be supported thereby and to leave exposed the under surface of said tubular member, a refractory wall supported by and extending upwardly from said metal members, a blast chamber positioned within and extending lengthwise of the refractory wall, means for admitting steam and air to said blast chamber, and means for discharging steam and air rearwardly from the blast chamber.

In testimony whereof I have signed my name to'this specification in the presence of two subscribing witnesses.

ORLAND D. ORVIS. Witnesses:

H. I. BERNHARD, M. G. POWELL. 

